Tunneler. The dragon can burrow through solid rock at half its burrowing speed and can leave a 10-foot-diameter tunnel in its wake.

Water Diviner. Once per day, as an action, the dragon can create water as if it had cast create or destroy water.

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Acid Breath (Recharge 5–6). The dragon exhales lightning in a 60-­-foot line that is 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw, taking 49 (11d8) acid damage on a failed save, or half as much damage on a successful one.